364 lines
10 KiB
Go
364 lines
10 KiB
Go
package state
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import (
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"bytes"
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"github.com/tendermint/basecoin/types"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-events"
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)
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// The accounts from the TxInputs must either already have
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// crypto.PubKey.(type) != nil, (it must be known),
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// or it must be specified in the TxInput. If redeclared,
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// the TxInput is modified and input.PubKey set to nil.
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func getInputs(state types.AccountGetter, ins []types.TxInput) (map[string]*types.Account, error) {
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accounts := map[string]*types.Account{}
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for _, in := range ins {
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// Account shouldn't be duplicated
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if _, ok := accounts[string(in.Address)]; ok {
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return nil, types.ErrDuplicateAddress
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}
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acc := state.GetAccount(in.Address)
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if acc == nil {
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return nil, types.ErrInvalidAddress
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}
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// PubKey should be present in either "account" or "in"
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if err := checkInputPubKey(in.Address, acc, in); err != nil {
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return nil, err
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}
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accounts[string(in.Address)] = acc
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}
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return accounts, nil
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}
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func getOrMakeOutputs(state types.AccountGetter, accounts map[string]*types.Account, outs []types.TxOutput) (map[string]*types.Account, error) {
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if accounts == nil {
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accounts = make(map[string]*types.Account)
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}
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for _, out := range outs {
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// Account shouldn't be duplicated
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if _, ok := accounts[string(out.Address)]; ok {
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return nil, types.ErrDuplicateAddress
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}
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acc := state.GetAccount(out.Address)
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// output account may be nil (new)
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if acc == nil {
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acc = &types.Account{
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PubKey: nil,
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Sequence: 0,
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Balance: 0,
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}
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}
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accounts[string(out.Address)] = acc
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}
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return accounts, nil
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}
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// Input must not have a redundant PubKey (i.e. Account already has PubKey).
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// NOTE: Account has PubKey if Sequence > 0
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func checkInputPubKey(address []byte, acc *types.Account, in types.TxInput) error {
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if acc.PubKey == nil {
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if in.PubKey == nil {
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return types.ErrUnknownPubKey
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}
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if !bytes.Equal(in.PubKey.Address(), address) {
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return types.ErrInvalidPubKey
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}
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acc.PubKey = in.PubKey
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} else {
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if in.PubKey != nil {
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return types.ErrInvalidPubKey
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}
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}
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return nil
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}
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func validateInputs(accounts map[string]*types.Account, signBytes []byte, ins []types.TxInput) (total int64, err error) {
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for _, in := range ins {
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acc := accounts[string(in.Address)]
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if acc == nil {
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PanicSanity("validateInputs() expects account in accounts")
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}
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err = validateInput(acc, signBytes, in)
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if err != nil {
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return
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}
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// Good. Add amount to total
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total += in.Amount
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}
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return total, nil
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}
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func validateInput(acc *types.Account, signBytes []byte, in types.TxInput) (err error) {
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// Check TxInput basic
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if err := in.ValidateBasic(); err != nil {
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return err
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}
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// Check signatures
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if !acc.PubKey.VerifyBytes(signBytes, in.Signature) {
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return types.ErrInvalidSignature
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}
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// Check sequences
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if acc.Sequence+1 != in.Sequence {
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return types.ErrInvalidSequence.AppendLog(Fmt("Got %v, expected %v", in.Sequence, acc.Sequence+1))
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}
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// Check amount
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if acc.Balance < in.Amount {
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return types.ErrInsufficientFunds
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}
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return nil
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}
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func validateOutputs(outs []types.TxOutput) (total int64, err error) {
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for _, out := range outs {
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// Check TxOutput basic
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if err := out.ValidateBasic(); err != nil {
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return 0, err
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}
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// Good. Add amount to total
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total += out.Amount
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}
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return total, nil
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}
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func adjustByInputs(accounts map[string]*types.Account, ins []types.TxInput) {
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for _, in := range ins {
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acc := accounts[string(in.Address)]
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if acc == nil {
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PanicSanity("adjustByInputs() expects account in accounts")
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}
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if acc.Balance < in.Amount {
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PanicSanity("adjustByInputs() expects sufficient funds")
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}
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acc.Balance -= in.Amount
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acc.Sequence += 1
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}
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}
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func adjustByOutputs(accounts map[string]*types.Account, outs []types.TxOutput) {
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for _, out := range outs {
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acc := accounts[string(out.Address)]
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if acc == nil {
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PanicSanity("adjustByOutputs() expects account in accounts")
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}
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acc.Balance += out.Amount
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}
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}
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// If the tx is invalid, an error will be returned.
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// Unlike ExecBlock(), state will not be altered.
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func ExecTx(blockCache *BlockCache, tx types.Tx, runCall bool, evc events.Fireable) (err error) {
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// TODO: do something with fees
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fees := int64(0)
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_s := blockCache.State() // hack to access validators and block height
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// Exec tx
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switch tx := tx.(type) {
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case *types.SendTx:
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accounts, err := getInputs(blockCache, tx.Inputs)
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if err != nil {
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return err
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}
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// add outputs to accounts map
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// if any outputs don't exist, all inputs must have CreateAccount perm
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accounts, err = getOrMakeOutputs(blockCache, accounts, tx.Outputs)
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if err != nil {
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return err
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}
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signBytes := tx.SignBytes(_s.ChainID)
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inTotal, err := validateInputs(accounts, signBytes, tx.Inputs)
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if err != nil {
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return err
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}
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outTotal, err := validateOutputs(tx.Outputs)
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if err != nil {
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return err
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}
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if outTotal > inTotal {
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return types.ErrInsufficientFunds
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}
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fee := inTotal - outTotal
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fees += fee
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// Good! Adjust accounts
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adjustByInputs(accounts, tx.Inputs)
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adjustByOutputs(accounts, tx.Outputs)
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for _, acc := range accounts {
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blockCache.UpdateAccount(acc)
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}
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// if the evc is nil, nothing will happen
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/*
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if evc != nil {
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for _, i := range tx.Inputs {
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evc.FireEvent(types.EventStringAccInput(i.Address), types.EventDataTx{tx, nil, ""})
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}
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for _, o := range tx.Outputs {
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evc.FireEvent(types.EventStringAccOutput(o.Address), types.EventDataTx{tx, nil, ""})
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}
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}
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*/
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return nil
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case *types.CallTx:
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var inAcc, outAcc *types.Account
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// Validate input
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inAcc = blockCache.GetAccount(tx.Input.Address)
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if inAcc == nil {
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log.Info(Fmt("Can't find in account %X", tx.Input.Address))
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return types.ErrInvalidAddress
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}
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// pubKey should be present in either "inAcc" or "tx.Input"
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if err := checkInputPubKey(tx.Input.Address, inAcc, tx.Input); err != nil {
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log.Info(Fmt("Can't find pubkey for %X", tx.Input.Address))
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return err
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}
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signBytes := tx.SignBytes(_s.ChainID)
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err := validateInput(inAcc, signBytes, tx.Input)
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if err != nil {
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log.Info(Fmt("validateInput failed on %X: %v", tx.Input.Address, err))
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return err
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}
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if tx.Input.Amount < tx.Fee {
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log.Info(Fmt("Sender did not send enough to cover the fee %X", tx.Input.Address))
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return types.ErrInsufficientFunds
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}
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if len(tx.Address) == 0 {
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return types.ErrInvalidAddress.AppendLog("Address cannot be zero")
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}
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// Validate output
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if len(tx.Address) != 20 {
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log.Info(Fmt("Destination address is not 20 bytes %X", tx.Address))
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return types.ErrInvalidAddress
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}
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// check if its a native contract
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// XXX if IsNativeContract(tx.Address) {...}
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// Output account may be nil if we are still in mempool and contract was created in same block as this tx
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// but that's fine, because the account will be created properly when the create tx runs in the block
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// and then this won't return nil. otherwise, we take their fee
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outAcc = blockCache.GetAccount(tx.Address)
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log.Info(Fmt("Out account: %v", outAcc))
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// Good!
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value := tx.Input.Amount - tx.Fee
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inAcc.Sequence += 1
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inAcc.Balance -= tx.Fee
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blockCache.UpdateAccount(inAcc)
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// The logic in runCall MUST NOT return.
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if runCall {
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// VM call variables
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var (
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gas int64 = tx.GasLimit
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err error = nil
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// caller *vm.Account = toVMAccount(inAcc)
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// callee *vm.Account = nil // initialized below
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// code []byte = nil
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// ret []byte = nil
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txCache = NewTxCache(blockCache)
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/*
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params = vm.Params{
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BlockHeight: int64(_s.LastBlockHeight),
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BlockHash: LeftPadWord256(_s.LastBlockHash),
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BlockTime: _s.LastBlockTime.Unix(),
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GasLimit: _s.GetGasLimit(),
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}
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*/
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)
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// if you call an account that doesn't exist
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// or an account with no code then we take fees (sorry pal)
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// NOTE: it's fine to create a contract and call it within one
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// block (nonce will prevent re-ordering of those txs)
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// but to create with one contract and call with another
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// you have to wait a block to avoid a re-ordering attack
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// that will take your fees
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if outAcc == nil {
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log.Info(Fmt("%X tries to call %X but it does not exist.", tx.Input.Address, tx.Address))
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err = types.ErrInvalidAddress
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goto CALL_COMPLETE
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}
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/*
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if len(outAcc.Code) == 0 {
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log.Info(Fmt("%X tries to call %X but code is blank.", inAcc.Address, tx.Address))
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err = types.ErrInvalidAddress
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goto CALL_COMPLETE
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}
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log.Info(Fmt("Code for this contract: %X", code))
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*/
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// Run VM call and sync txCache to blockCache.
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{ // Capture scope for goto.
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// Write caller/callee to txCache.
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// txCache.UpdateAccount(caller)
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// txCache.UpdateAccount(callee)
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// vmach := vm.NewVM(txCache, params, caller.Address, types.TxID(_s.ChainID, tx))
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// vmach.SetFireable(evc)
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// NOTE: Call() transfers the value from caller to callee iff call succeeds.
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// ret, err = vmach.Call(caller, callee, code, tx.Data, value, &gas)
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if err != nil {
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// Failure. Charge the gas fee. The 'value' was otherwise not transferred.
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log.Info(Fmt("Error on execution: %v", err))
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goto CALL_COMPLETE
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}
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log.Info("Successful execution")
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txCache.Sync()
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}
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CALL_COMPLETE: // err may or may not be nil.
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// Create a receipt from the ret and whether errored.
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// log.Notice("VM call complete", "caller", caller, "callee", callee, "return", ret, "err", err)
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// Fire Events for sender and receiver
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// a separate event will be fired from vm for each additional call
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/*
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if evc != nil {
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exception := ""
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if err != nil {
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exception = err.Error()
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}
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evc.FireEvent(types.EventStringAccInput(tx.Input.Address), types.EventDataTx{tx, ret, exception})
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evc.FireEvent(types.EventStringAccOutput(tx.Address), types.EventDataTx{tx, ret, exception})
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}
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*/
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} else {
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// The mempool does not call txs until
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// the proposer determines the order of txs.
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// So mempool will skip the actual .Call(),
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// and only deduct from the caller's balance.
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inAcc.Balance -= value
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blockCache.UpdateAccount(inAcc)
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}
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return nil
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default:
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// binary decoding should not let this happen
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PanicSanity("Unknown Tx type")
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return nil
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}
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}
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//-----------------------------------------------------------------------------
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type InvalidTxError struct {
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Tx types.Tx
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Reason error
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}
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func (txErr InvalidTxError) Error() string {
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return Fmt("Invalid tx: [%v] reason: [%v]", txErr.Tx, txErr.Reason)
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}
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